An even better (although quite contrived) example is given in the movie "Predestination": http://www.imdb.com/title/tt2397535/ http://www.imdb.com/title/tt2397

An even better (although quite contrived) example is given in the movie "Predestination": http://www.imdb.com/title/tt2397535/ http://www.imdb.com/title/tt2397535/ Alternatively, read the short story "All you Zombies" by Robert A. Heinlein, on which most of the movie is based: http://emilkirkegaard.dk/en/wp-content/uploads/Robert-A.-Heinlein-All-You-Zombies.pdf http://emilkirkegaard.dk/en/wp-content/uploads/Robert-A.-Hei...